Joining segments of the secondary in a linear motor driven elevator apparatus

Abstract

The present invention provides a linear motor driven elevator apparatus which enables a decrease in the thrust variation at the passage of primary windings of a linear induction motor loaded on a car or a balance weight through joints of secondary conductors and which can prevent an unpleasant impression from being given to the passengers. In the elevator apparatus, each of the connections of the secondary conductor members of the linear induction motor serving as a drive source for vertically driving an elevator car has a structure in which each of the secondary conductor members is notched to about half of the thickness thereof, and the notch portions are superposed. The length of each of the notch portions is set to a value greater than the pole pitch of the primary windings of the linear induction motor, and the set heights of the joints are different from each other.

What is claimed is: 
     
       1. A linear motor driven elevator apparatus comprising: a secondary conductor disposed in an elevator passage, said secondary conductor having a plurality of secondary conductor members, each secondary conductor member including a notched portion disposed at a first end, the secondary conductor members being connected in series so that respective notched portions are abutted; and   a linear inductor motor having primary windings loaded on a balance weight and respectively disposed near said secondary conductors;   wherein the notched portion of each of said secondary conductor members is notched to about half of the thickness of each of the secondary conductor members and the notched portion of each of the secondary conductor members has a length (D 1 ) which is greater than the pole pitch (τ) of said primary windings of said linear induction motor.   
     
     
       2. A linear motor driven elevator apparatus comprising: a first secondary conductor disposed in an elevator passage, said first secondary conductor having a plurality of secondary conductive members, each secondary conductive member including a notched portion disposed at a first end, the secondary members being connected in series so that respective notched portions are abutted against each other, the notched portions of each of said secondary conductor members being notched to about half of the thickness of the secondary conductor member;   a linear induction motor having primary windings loaded on a balanced weight and respectively disposed near said secondary conductors; and   a second secondary conductor disposed in an elevator passage wherein the distance of the notch connection of the first secondary conductor from the bottom of the elevator passageway is greater than the distance of the notch connection of the second secondary conductor from the bottom of the elevator passageway by a distance (D 2 ) which is greater than the length (L) of said primary windings of said linear induction motor in the direction of travel thereof.   
     
     
       3. A linear motor driven elevator apparatus comprising: a secondary conductor disposed in an elevator passage having first and second secondary conductor members connected in series in the lengthwise direction thereof so as to be abutted against each other; and   a linear induction motor having primary windings disposed on a balance weight and positioned near said secondary conductor, each of said first and second secondary conductor members including first and second plate members, each plate member having first and second ends, the plate member being disposed such that the first end of the first plate member of the first secondary conductor is abutted against the first end of the second plate member of the second secondary conductor to form a first joint and the first end of the second plate member of the first secondary conductor member is abutted against the first end of the first plate member of the second secondary conductor to form a second joint and a lengthwise distance D exists between the first joint and the second joint wherein the lengthwise distance D, is greater than the length of said primary windings of said linear induction motor in the direction of travel thereof.   
     
     
       4. A linear motor driven elevator apparatus comprising: a secondary conductor disposed in an elevator passage having first and second secondary conductor members connected in series in a lengthwise direction thereof so as to be abutted against other;   a linear induction motor having primary windings disposed on a balanced weight and positioned near said secondary conductors, each of said first and second secondary conductor members including first and second plate members, each plate member having first and second ends, the plate members being disposed such that the first end of the first plate member of the first secondary conductor is abutted against the first end of the second plate member of the second secondary conductor to form a joint and the first end of the second plate member of the first secondary conductor member is abutted against the first end of the first plate member of the second secondary conductor to form a second joint and a lengthwise distance D exist between the first joint and the second joint, the lengthwise distance D being greater than zero; and   a second secondary conductor disposed in the elevator passage such that wherein the difference in the lengthwise distance of the first joint of said first secondary conductor from the bottom of the elevator passage and the lengthwise distance of the second joint of said second secondary conductor from the bottom of the elevator passage is greater than the length of the primary windings of said linear inductor motor.